YR 2 Topic 2 (statistics)

Question 1

N

Answer 1

intersection
P(AnB) = P(A) x P(B) (if independent) 
double shading

Question 2

U

Answer 2

union
P(AUB) =P(A) + P(B) -P(AnB) (if mutually exclusive) P(AnB) = 0
all shaded

Question 3

not

Answer 3

P(A’)

P(A) + P(A’) = 1 (if mutually exclusive)

Question 4

conditional probabilities

Answer 4

dependent probabilities

Question 5

P(A|B)

Answer 5

probability that B occurs given A has already occurred

Question 6

addition rule

Answer 6

P(A) + P(B) - P(AnB) = P(AUB)

Question 7

P(B|A) equation

Answer 7

P(AnB) divided by P(A)